<p>Lastly, define <b>class</b> of the columns for the tabs in <b>_columnLayout</b> variable, e.g.,<br>
<pre>
...
_default: {
	bg:'normal',
	c1:'span-8',
	c2:'span-8',
	c3:'span-8 last',
	c4:'span-24 last'
},
t2:{	bg:'hehe',
	 <b>c1:'span-24 last',
	 c4:'span-8 last'</b>},
...
</pre>

<ul>
	<li><b>_default</b> - default class definitions of columns</li>
	<li><b>t2, t3</b> - class definitions for a given tab</li>
	<li><b>bg</b> - class definition for <b>body</b>, which will be switched when changing tab</li>
	<li><b>c1, c2, c3</b> - column class definitions</li>
</ul>
</p>